CVE-2026-55380

PYSEC-2026-2256 · BIT-pillow-2026-55380 · CVE-2026-55380 · GHSA-phj9-mv4w-65pm

Published Jul 6, 2026 · Modified Jul 13, 2026

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Description

Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() read image dimensions from the GD 2.x header and stored them in self._size without calling Image._decompression_bomb_check(), allowing a crafted .gd file to trigger excessive C-heap allocation when loaded. This issue is fixed in version 12.3.0.

References

ADVISORY https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst
FIX https://github.com/python-pillow/Pillow/commit/f39b0ae6624eb2d7c5c5d651d9bb5fdbd96a8675
EVIDENCE https://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pm

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CVE-2026-55380

Description

References

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